Firewalls are a vital component in any internet-connected computer lab or office. Because commercial firewalls are often massively over-sized for small organizations, many technical users opt to build their own firewalls. For less technical users, pfSense provides an alternative to pricier commercial options. pfSense is a free network firewall based on the FreeBSD operating system. It can be installed on an inexpensive computer (usually one with at least two network cards) to create a full-featured firewall. The included web-based interface is able to configure every part of the system. Users need not have any knowledge of UNIX concepts, won't need to use the command line, and will not need to manually edit firewall rules. The pfSense Hardware Requirements and Guidance page details recommended hardware based on how much traffic the firewall will handle. For networks that have less than 100 Mbps of traffic, a 1 GHz processor with 1 GB of memory and 1 GB of storage should be sufficient.